JPH0363191A - Method and apparatus for automatically changing over operating speed of perforation head - Google Patents

Abstract

PURPOSE:To eliminate the mechanical fatigue of a perforation machine caused by intermittent operation and a lowering of the quality of a product by detecting the passage of succeeding printed books and changing over the operating speed of a head corresponding to the passage interval to continuously perform the yarn binding of the printed book without stopping the operation of the perforation machine. CONSTITUTION:The perforation machine 1 arranged to the perforation machine binding part of the processing line of the passbook body W as a printed book and a controller 2 controlling the operating speed of a perforation head 11 are mounted and a body detection sensor 3 detecting the front end of the body W is provided on the upstream side of a perforation head 11. The controller 2 is connected to the control part of a motor 12 through a speed change-over circuit 14 and the signal wire of the body detection sensor 3 is connected to said speed change-over circuit 4. The detection of the passage of a preceding printed book and that of the succeeding printed book are continuously performed on the upstream side of a processing line and the change-over of predetermined speed operation and low speed operation is repeated by the comparison of the detected signal interval and a set value in the perforation machine part on the downstream side of the processing part and the operation of the perforation machine part is continuously performed. By this method, the mechanical fatigue of the apparatus caused by intermittent operation is reduced and the lowering of the processing quality of a processed product can be eliminated.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention provides a method and device for automatically switching the head operating speed of a sewing machine that thread-stitches printed books in a bookbinding line in accordance with the feeding speed of printed books. It is related to.

[Conventional technology]

When a sewing machine is installed on a line conveyor to thread-stitch printed books, it is impossible to keep the operating speed of the sewing machine head perfectly consistent with the line speed, so the stitching section of the line In order to prevent stagnation, the operating speed of the sewing machine head is set slightly higher than the line speed so that a stitching speed slightly higher than the originally required stitching speed can be obtained.

Conventionally, such speed settings have been done exclusively by manually operating the variable load resistance of the sewing machine drive motor, as shown in the circuit diagram in Figure 5, which is built into the controller that controls the operation of the sewing machine. .

[Problem to be solved by the invention]

By the way, in the conventional method of manually adjusting the sewing machine head speed and keeping it semi-fixed, the sewing machine head speed always exceeds the line speed, so the sewing machine head has to wait for the printing material to be fed to the head after a certain period of operation and then stop. For example, in the line that binds the main text of bankbooks, the head rotation speed has to be reduced from 400 rpm to 400 rpm.
This results in a problem of increased wear and quality deterioration due to failure of the sewing machine head or disturbance of the binding thread.

The present invention aims to solve these conventional problems by suppressing changes in the rotational speed of the sewing machine head as much as possible, synchronizing the operating speed of the sewing machine head and the operating speed of the processing line with a difference of several percent, It is an object of the present invention to provide a method and device capable of eliminating mechanical fatigue of a sewing machine and deterioration of product quality caused by intermittent operation.

[Means to solve the problem]

In order to achieve the above object, the method of the present invention involves operating the head of the sewing machine at a predetermined constant speed when stitching printed books conveyed on a processing line using a sewing machine built into the processing line. While the books are being thread-bound one after another, the passage of the subsequent book being conveyed on the line is detected upstream, and the operating speed of the head is switched depending on the interval between passes, and while the book continues to be operated, the book is being printed. The sewing machine is characterized in that thread binding is performed continuously without stopping the operation of the sewing machine.

Furthermore, the apparatus of the present invention includes a sewing machine installed on a book processing line and a controller that controls the operating speed of the head of the sewing machine, in order to carry out the above method.
A print detection sensor is provided upstream of the head of the sewing machine in the processing line, and the sensor is connected to the controller via a sequencer that takes in the detection signal and outputs a control signal according to the signal interval. do.

[Effect]

In the method of the present invention, upstream of the processing line, the passage of the preceding printing book and the following printing book is continuously detected, and in the sewing machine section downstream of the processing line, the detection is performed at a predetermined constant speed. Switching between operation at another speed and operation at another speed lower than that is repeated by comparing the detection signal interval with a set value, and as a result, the sewing machine is operated continuously.

In addition, in the device of the present invention, the passing of the printing books is sequentially detected by the printing book detection sensor installed upstream of the head of the sewing machine in the processing line, and the intervals between these detection signals and the operation at a predetermined constant speed are determined. A sequencer makes a comparison with the corresponding interval, and the sequencer outputs a switching signal corresponding to the comparison result to the controller, thereby switching the operating speed of the sewing machine.

〔Example〕

Next, a detailed explanation will be given based on an example in which the present invention is applied to a passbook manufacturing process.

Figure 1 is a system diagram showing the sewing machine binding section in the passbook manufacturing line. The sewing machine 1 includes a controller 2 that controls the operating speed of the sewing machine 1 and the head 11 of the same sewing machine. In this device, a text detection sensor 3 for detecting the front end of the text W is provided approximately 100 mm upstream of the sewing machine head 11. A motor 12 that drives the sewing machine 1 is connected to a power source 5, and a controller 2 is connected to a control section of the motor 12 via a speed switching circuit 4, and a text detection sensor 3 is connected to the speed switching circuit 4. The signal line is connected. Note that the reference numeral 6 in this figure indicates a control power source.

FIG. 2 is a circuit diagram showing the control system of this device, in which the speed switching circuit 4 is connected to the sequencer 41. relay switch 42
and an additional variable resistor 43.

'The signal line of the text detection sensor 3 is connected to a sequencer 41, and the output line of the sequencer 41 is connected to a relay switch 42 via a relay box 44. Switching is performed to insert the variable resistor 43 provided in the circuit in series or bypass it.

In the apparatus configured in this manner (hereinafter, refer to FIGS. 1 and 2 together), the preceding text Wl conveyed on the processing line is thread-stitched by the sewing machine 1 built into the processing line. At this time, the sewing machine head 11 is operated at a predetermined constant speed to thread-stitch the text Wl, and the text detection sensor 3 detects passage of the front end of the text Wl that follows upstream. In this sensor, the signal is turned off when the trailing edge of the preceding text W+ passes, and this state continues until the leading edge of the following text reaches the detection position of the text detection sensor 3. Therefore, by signal processing the off time in the sequencer 41, the passing interval of the text W can be adjusted to the sewing machine head 11.
This can be connected to sensing whether or not the passing interval has become longer than that of driving at a predetermined constant speed. If the result exceeds a predetermined value, the sequencer 41 outputs a switching signal, the coil of the relay switch 42 is excited, the switch is switched, and the variable resistor 43 .
45 now acts as a series load resistance for the motor 12. Then, the sewing machine head 11 is switched from the initially set rotational speed of, for example, 4000 rpm to 230 Orpm, which is reduced by about 42%, and continues to operate, until the next main text Wt is stitched at that speed. This deceleration operation continues until the middle of the thread binding of the text Wl, and when it is sensed that the off time has become less than the set value by the detection of the leading edge of the text that follows, the relay switch 42 is switched to the opposite direction, and the motor 12 is initially The rotation speed is returned to the set rotation speed. In this way, in the apparatus of this embodiment, low speed operation is performed at a ratio of about one out of three.

Figures 3 and 4 compare and show the operations of the conventional device and the device of this embodiment. Figure 3 shows the relationship between line rotation speed and binding margin length, and Figure 4 shows the relationship between line rotation This shows the relationship between the number and the head speed. In both figures, fa) is the conventional example, and (b) is the conventional example.
shows the case of the above embodiment.

In the above-mentioned embodiment, if the head speed is made approximately equal to the line speed as in the conventional case, the amount of deceleration will be within the range of a few percent, and mechanical fatigue of the equipment and product damage caused by intermittent operation, which were conventionally seen, will be reduced. The quality deterioration has been resolved. Additionally, the permissible range for setting the head speed is wider than that of conventional models, and operability is greatly improved.

Although the present invention has been described above in detail based on one embodiment thereof, the present invention is not limited to the above-mentioned embodiment, and various details thereof may be modified within the scope of the claims. This configuration can be applied to various uses by changing the configuration, and in particular, this configuration is adopted for the sake of simplicity when changing the speed, and is not necessarily limited to two stages, high and low. , depending on the case, may be controlled continuously, and the specific configuration of the switching circuit is not limited to that described above.

〔Effect of the invention〕

As explained above, the method of the present invention sequentially thread-stitches printed books, detects the passing of the printed books upstream, and switches the operating speed of the sewing machine head depending on the interval between the passing of the printed books while continuing the operation. Since the thread binding of printed books is performed continuously without stopping the sewing machine, intermittent operation of the sewing machine head can be avoided, reducing mechanical fatigue of the equipment caused by intermittent operation, and improving the quality of processed products. This has the effect of eliminating the decrease in

Further, according to the apparatus of the present invention, a printing book detection sensor is provided upstream of the head of a sewing machine in a processing line, and the sensor is processed through a sequencer that processes the detection signal, measures the interval, and outputs a control signal. Since it is configured to be connected to a controller, continuous operation of the sewing machine can be easily realized by simply adding these means to the control system of existing equipment, and it is also fully compatible with changes in line speed. equipment can be obtained.

[Brief explanation of drawings]

Fig. 1 is a system diagram showing a device according to an embodiment of the present invention, Fig. 2 is a circuit diagram showing its control system, and Fig. 3 is a line rotation speed versus binding length of a conventional device and the device of this embodiment. FIG. 4 is a characteristic diagram comparing the relationship between line rotation speed and head speed, and FIG. 5 is a circuit diagram of a conventional sewing machine operating speed control device. DESCRIPTION OF SYMBOLS 1... Sewing machine, 2... Controller, 3... Text detection sensor, 4... Speed switching circuit, 5... Power source for power, 6... Power source for control, 11... Sewing machine head ,
12...Motor, 41...Sequencer, 42...
Relay switch, 43... Variable resistor, 44... Relay box, 45... Variable resistor, W.

Claims (2)

[Claims] (1) When thread-stitching printed books conveyed on a processing line using a sewing machine installed in the same line, the head of the sewing machine is operated at a predetermined constant speed to thread-stitch the printed books one by one, while Detects the passage of the subsequent printing book being conveyed on the line, switches the operating speed of the head according to the interval of passing, and stops the operation of the sewing machine to thread-stitch the printing book while continuing the operation. A method for automatically changing the operating speed of a sewing machine head, which is characterized in that the operation speed can be changed continuously without any interruption. (2) In a device equipped with a controller that controls the operating speed of a sewing machine installed on a print processing line and the head of the same sewing machine, a print detection sensor is installed upstream of the head of the sewing machine in the processing line. An automatic sewing machine head operating speed switching device characterized in that the sensor is connected to the controller via a sequencer that takes in the detection signal and outputs a control signal according to the signal interval.